Ignore KeyError and continue program

Question

In Python 3 I have a program coded as below. It basically takes an input from a user and checks it against a dictionary (EXCHANGE_DATA) and outputs a list of information.

from shares import EXCHANGE_DATA
portfolio_str=input("Please list portfolio: ")
portfolio_str= portfolio_str.replace(' ','')
portfolio_str= portfolio_str.upper()
portfolio_list= portfolio_str.split(',')
print()
print('{:<6} {:<20} {:>8}'.format('Code', 'Name', 'Price'))
EXCHANGE_DATA = {code:(share_name,share_value) for code, share_name, share_value in EXCHANGE_DATA}
try:
     for code in portfolio_list:
              share_name, share_value = EXCHANGE_DATA[code]
              print('{:<6} {:<20} {:>8.2f}'.format(code, share_name, share_value))  
except KeyError:
     pass

Example input: GPG,HNZ,DIL,FRE

The output is as follows:

Please list portfolio: GPG,HNZ,DIL,FRE

Code  Name                   Price
GPG   Guinnesspeat            2.32
HNZ   Heartland Nz            3.85
DIL   Diligent                5.30
FRE   Freightway              6.71

But if I have an input like:

AIR,HNZ,AAX,DIL,AZX

where the terms AAX,AZX do not exist in the dictionary (EXCHANGE_DATA) but the terms AIR,HNZ,DIL do. The program obviously would throw a KeyError exception but I have neutralized this with pass. The problem is after the pass code has been executed the program exits and I need it to continue on and execute the for loop on DIL. How do I do this?

Answer 1

Why not:

 for code in portfolio_list:
     try:
         share_name, share_value = EXCHANGE_DATA[code]
         print('{:<6} {:<20} {:>8.2f}'.format(code, share_name, share_value)   
     except KeyError:
         continue

OR check dict.get method:

 for code in portfolio_list:
     res = EXCHANGE_DATA.get(code, None)
     if res:
         print('{:<6} {:<20} {:>8.2f}'.format(code, *res)   

And as @RedBaron mentioned:

 for code in portfolio_list:
     if code in EXCHANGE_DATA:
         print('{:<6} {:<20} {:>8.2f}'.format(code, *EXCHANGE_DATA[code])   

Answer 2

catch the exception in the loop

for code in portfolio_list:
    try:
        share_name, share_value = EXCHANGE_DATA[code]
        print('{:<6} {:<20} {:>8.2f}'.format(code, share_name, share_value)   
    except KeyError:
        pass

Edit: The more pythonic way would be to test if the dict has the element first

for code in portfolio_list:
    if code in EXCHANGE_DATA:
        share_name, share_value = EXCHANGE_DATA[code]
        print('{:<6} {:<20} {:>8.2f}'.format(code, share_name, share_value)